Update dependency leaflet.markercluster to v1.5.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
leaflet.markercluster	1.4.1 → 1.5.3

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Release Notes

Leaflet/Leaflet.markercluster (leaflet.markercluster)

v1.5.3

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Bugfixes

• Removing unnecessary files on npm package
• Inlucding correct versioning on Github repo

v1.5.2

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Improvements

• Merged PR 1022 for Spiderfy on every room by MasterEric

Bugfixes

• Fixed issue 907 and 967 with PR 1027 from DerGuteWolf
• Removed unexpected dependencies in previous npm package

v1.5.1

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Improvements

• Spiderfy on keypress 1005 by @​neorth, a fix for issue 940 and 947

v1.5.0

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Bugfixes

• Updated peer dependency to match latest leaflet version (by @​sanjpareek) #​976

(all changes below without author notice were made by @​danzel)

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